I would talk to your doctor about ways to adapt your movements.

If what your saying the case, then I would say that it would be preety hard to do a conventional roll, but I don't see as why you couldn't form some other technique.

definitely consult your doctor first,  one method to test the waters would be to just lay on your back and grab your knees.  from there Sllllowlly rock yourself back and forth and just test how everything is feeling.  do this on the softest surface you can find (mat or carpet) and just work it slowly and don't force anything.  If pain comes out of this stop right away and consider something else.

What Mark says is very true. There are areas in which it will affect you more than others. I.E. your drops and rolls might be affected more than your balancing. I can tell you I don't do any drops and still have loads of fun. You can practice plenty of vaults over rails, balancing and precisions. Stay away from Kongs for now, though (I'd suppose, but again, not an expert)

Take it slow. Consult with your physician, but in the end, stay away from what you think you might not be ready for, and don't push through pain or discomfort. After all, you want your surgery to be a success too.